Hydroxyorganosiloxanes and copolymers



United States Patent 3,317,460 HY DROXYORGANOSILOXAN ES AND COPOLYMERS Harold A. Clark and Loren A. Haluska, Midland, Mich., assignors to Dow Corning Corporation, Midland, Mich., a corporation of Michigan No Drawing. Filed Apr. 1, 1963, Ser. No. 269,781 21 Claims. (Cl. 260-465) This invention relates to new silanes and siloxanes and to copolymers containing the siloxanes.

The silanes and siloxanes of this invention are useful as curing agents for isocyanate prepolymers, for preparing polyurethane rubbers and for making varnishes;

More particularly, this invention relates to siloxanes of the general formula wherein R is a trivalent or tetravalent hydrocarbon radical or hydrocarbon ether radical that is bonded to the silicon atom through a silicon-carbon bond, R is a monovalent hydrocarbon radical free of aliphatic unsaturation, a is an integer from 0 to 3 inclusive, b is 1 or 2, c is 2 or 3 and all of the hydroxyl groups are primary hydroxyl groups. It is obvious, of course, that the sum of a-l-b cannot be greater than 3.

This invention also relates to silanes of the general formula [(HO) R] SiR',,, wherein R, R, a, b and c have the above defined meanings. It is obvious, of course, that the sum of a-l-b must be equal to 4.

Also, this inventioin relates to copolymers of the above siloxanes with siloxanes having the general formula R" SiO wherein R" is a monovalent hydrocarbon or halogenated hydrocarbon radical free of aliphatic unsaturation and n is an integer from 0 to 3 inclusive.

In the above formulae, for example, the [(HO) R] group can be, for example, aliphatic radicals such as (HOCH CHCH CH (HOCH CH (HOCH CHCH CH CH CH (HOCH CH CCH CH (HOCH CHz) HOCH CHCH (CH OH CH CH CH nocn cn cn cn cn cu 011,011,011

CH CH CH(CHz a) HOCH CH CHCH CH (HOCH CHOCH CH CH (HOCH; CHOCH CH (HOCH (HO CH OIH CH CHQ) CHOCH CH CH (HOCH CH CHCH OCH CH CH or a (HOCHZ) 2 H3) 2( 2 2) 6OCH2CH2CH2 7 group and cyclic radicals such as 50 came (CH3) cmocmcnr HocHmo crmcmoomcm- In the above formulae the R and R" groupscan be, for'exarnple, alkyl groups such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, amyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl, pentadecyl, octadecyl; cyclic hydrocarbon groups such as phenyl, tolyl, benzyl, xenyl,

3,317,460 Patented May 2, 1967 ice naphthyl or a cyclohexyl group. In addition, the R" group can also be haloalkyl groups such as or a C F CH CH group and halogenated cyclic hydrocarbon radicals such as chlorocyclohexyl, a,u,u-trifluorotolyl, bromophenyl, pentachloroxenyl, chloronaphthyl and chlorocyclopentyl.

The silanes and siloxanes of this invention can be prepared by any suitable process such as by the addition of the appropriate hydroxy olefinic compound to the appropriate silane or siloxane containing one or two siliconbonded hydrogen atoms per silicon atom, in the presence of a platinum catalyst. This and other suitable processes by which these silanes and siloxanes can be prepared are well known and Will be obvious to those skilled in the art. Illustrative of these processes is the one disclosed in US. Patent 2,823,218.

The copolymers of this invention contain at least one siloxane unit of the general formula the remaining siloxane units being of the general formula R" SiO These copolymers can be prepared by any of the well known means such as by first preparing a copolymer containing silicon-bonded hydrogen atoms and then reacting the resultant copolymer with the appropriate hydroxy olefinic compound in the presence of a platinum catalyst.

In order that those skilled in the art may better understand how the present invention can be practiced, the following examples are given by way of illustration and not by way of limitation.

Example 1 244 g. of trimethylolpropanemonoallylether, 0.5 g. of a 1 percent solution of platinum (as chloroplatinic acid) in dimethylphthalate and 1 g. of Seasorb 43 (magnesium oxide) were mixed and heated to 144 C. Then 200 g. of the siloxane H(CH Si[OSi(CH OSi(CH l-I was added to the mixture and the resultant mixture heated at 142-144 C. for 24 hours. The reaction mixture was then stripped to 182 C. at 6 mm. of pressure leaving 329.8 g. of the product in the pot. The product was OHZOH CH CH3 CHQQH CHEICHZ-CHZO (oHnssnosi(0H3)zh-uoducmnoomo 011,011v

CHzOH CH3 7 CH3 0112011 and had a viscosity of 689.4 'cs. at 25 C.

Example 2 g. of the monoallylether of pentaerythritol, 0.3 g. of a 1 percent solution of platinum (as chloroplatinic acid) in dimethylphthalate and 1 g. of charcoal were mixed and heated to C. Then a solution of 141.8 g. of the SllOXanC in 74.7 g. of xylene was added to the mixture and the resultant mixture heated at 140-147 C. for 24 hours. The reaction mixture was then stripped to 183 C. at 2 mm. of pressure leaving 169.5 g. of the product in the pot. The product was and had a viscosity of 253.5 cs. at 25 C.

3 Example 3 191.3 g. of trimethylolpropanemonoallylether, 0.3 g. of a 1 percent solution of platinum (as chloroplatinic acid) in dimethylphthalate and 1 g. of Seasorb 43 (magnesium oxide) were mixed and heated to 140 C. Then 67.1 g. of the siloxane H(CH SiOSi(CH H was added to the mixture and the resultant mixture heated at 139l60 C. for 24 hours. The reaction mixture was then stripped to 184 C. at 1.1 mm. of pressure leaving 146.6 g. of the product in the pot. The product was CHzOH CH; CH: CH2OH CHICHaC-CHiO(CH2)3SlOSl(CH2)ZOGHzCHICIH| 0132011 CH; CH: onion and had a viscosity of 4,639 cs. at 25 C.

Example 4 274.3 g. of trimethylolpropanemonoallylether, 0.5 g. of a 1 percent solution of platinum (as chloroplatinic acid) in dimethylphthalate and 1 g. of Seasorb 43 (magnesium oxide) were mixed and heated to 143 C. Then 203 g. of the siloxane (13H: H(CHI)2SlOSlOSl(OHB)2H was added to the reaction mixture and the resultant mixture heated at 140-143 C. for 24 hours. The reaction mixture was then stripped to 185 C. at 1.4 mm. of pressure leaving 325.7 g. of the product in the pot. The product was CHaOH CH; CH CH CHQOH cHtoHir l-oHio(oHa)assio-si(om)i0 om-o CHzCH! zOH Ha o a a CH OH and had a viscosity of 4,639 cs. at 25 C.

Example 5 A mixture of 382 g. of (C H )(CH )SiCl 177 g. of (C3H5)HSlCl3 and 374 g. of toluene was added to 1,020 g. of water and hydrolyzed to yield a hydrolyzate containing a copolymer of (C H (CH )SiO and -(C H )HSiO units. The hydrolyzate was washed 3 times with water to remove excess HCl, then 18 drops of concentrated H 50 was added and the hydrolyzate refluxed at l07110 C. for 2 /2 hours. Then 60 g. of Witcarb (CaCO was added, the mixture stirred for 45 minutes at about 35 C. and then filtered. The filtrate was then stripped to 150 C. at about 3-4 mm. of pressure to obtain the product.

A mixture of 46.4 g. of trimethylolpropanemonoallylether, 50 g. of Cellosolve acetate and drops of a .1 M chloroplatinic acid solution in butyl acetate was prepared and heated to 110 C. Then a mixture of 100 g. of the fluid prepared above and 47.6 g. of Cellosolve acetate was added slowly over a period of about 9 minutes. An exothermic reaction took place. A light tan solution of low viscosity which was a copolymer of (C H (CH )SiO and (ctnasio onion (oHmo 011200112011:

units was obtained.

Example 6 A mixture of 174 g. of trimethylolpropanemonoallylether and 20 drops of a .1 M chloroplatinic acid solution in butyl acetate was prepared and heated to 110 C. Then 61 g. of phenylmethylsilane was added slowly over a period of about 18 minutes. The reaction was very exothermic so the mixture was externally cooled during the addition to keep the temperature of the mixture in the range from 120-130 C. A grey solution of low viscosity which was a silane of the formula below was obtained.

CHzOH C5H5 CHI CHaCHaC-CHzO (CH2)aSi(CHz)aO CHr-JJCHrCHz.

CHzQH CH: 1110K Example 7 CHIOH C5115 05H; CHzOH CHaCHgC-CHzO(CH2)aSiOSi(CH2):O OH:- CHIGHI HzoH OH] H: H2OH Example 8 A mixture of 102.4 g. of trimethylolpropanemonoallylether, 201.6 g. of xylene and 27 drops of a .1 M chloroplatinic acid solution in butyl acetate was prepared and heated to C. Then 200 g. of a solution of a copolymer of (C H )(CH )SiO units and (CH )HSiO units in the ratio of about 2.25:1 in xylene (about 66 percent solids) was added slowly over a period of about 10 minutes. Heating of the mixture was stopped when the addition of the copolymer was started. An exothermic reaction took place with the temperature of the mixture rising to about 124 C. A copolymer of (C H )(CH )SiO and [CH CH C(CH OH) CH O(CH (CH )SiO units was obtained.

Example 9 When stoichiometric amounts of the following silanes and hydroxy olefinic compounds are reacted employing the process of Example 6 or 7, the indicated product is obtained.

(A) Silane( C3H5) S1H Olefin Product- (C H Si (CH OCH C(CH OH 1 Silane- 2( C3H7 Olefin- (HOCH CH CH CHO (CH OCH CH=CH PI'OduCt--(CH3 2(C3H7 O (CH CH CH OH) 2 Silane- SiHz Olefin- HOCH CH CCH=CH PI'OdUCt Si 3] 3 Example 10 When stoichiometric amounts of the following siloxanes and hydroxy olefinic compounds are reacted employing the process of Example 1, 4 or 7, the indicated product is obtained. In this example x, q, m, w, and y are integers.

Siloxane-H (CH Si [OSi (CH (CHzCHzCFg OSi Product- CH CH C CH OH) CH O (CH (CH 3 Si Osi 3) 2 2 3) lx 3 )2 2) a OCH C CHQOH) gcHgcHg] 5 6 (C t 6. A siloxane as defined in claim 5 wherein b is 1. Si1oXane H2(CH3)Si[oSi(cH3)2]mOSi(CH3)H2 7. A siloxane as defined 1n clalm 5 wherem b 1s 2.

O1efin (HOcH2CH2)2CHCH2OCH2CH=CH2 8. A copolymer consisting essentially of at least one (HOCHZCH2)2CHCH2O(CHZ)3]2(CH3)Si siloxane unit havlng the general formula [OSi(CH OSi(CH [(CH OCH CH cH2CH2OH)2]2 Iii )e l 4rb/2 SiloxaneH(CH Si OSi(CH OSi( CH H Olefin-CH CH C(CH OH) CH OCH CH=CH wherein each R is independently selected from the group Product consisting of trivalent and tetravalent hydrocarbon and OH] I V (IIH: cHaGHiO(CHQOHMCILO(cHmSll-[osi(oHa):].0s1(cH,)t0cmc(cmofi cHicHa 0H1 OH;

(E) hydrocarbon ether radicals and is bonded to the silicon atom through a silicon-carbon bond, R' is a monovalent 6 $2E gg g 2Q hydrocarbon radical free of aliphatic unsaturation, a is Product 3 2 2 2 an integer from 0 to 3 inclusive, b is an integer from 1 to 2 inclusive, 0 is an integer from 2 to 3 inclusive and R all the hydroxyl groups are primary hydroxyl groups, the (HOOHzhCGHiOQBMsIl-l0s1(OHt)alyosuomn-ocmcwmom: remaining siloxane units having the general formula OH: OH: n l n/g Example 11 wherein each R" is independently selected from the group 0 consisting of monovalent hydrocarbon and halogenated hydrocarbon radicals free of aliphatic unsaturation and n is an integer from 0 to 3 inclusive.

The copolymers listed below containing the specified units can be prepared when the appropriate materials are employed in the process of Example 5.

(A) (CF CH CH Si0 and 9. A copolymer as defined by claim 8 wherein the (CH3)[CH CH C(CH OH) CH 0(CH ]SiO siloxane (1) has thegeneral formula CH3SiO3 2' and I (C 11 [CHgCHgC (CH OH CH O (CH Si0 e (C) (CH SiO, (C H (CH )SiO, CH SiO and [CH3 Hl 2 )2 2 2)3]bsl04nb/I (C6H5) 2)s 2 2)3] (D) C H SiO CH SiO (G l-I (CH )SiO and 10. A copolymer as defined by claim 9 wherein b is 1. 3)[ 2 2 2)2 z 2)a 40 11. A copolymer as defined by claim 10 wherein R" O(CH ]SiO of siloxane (2) is selected from the group consisting of (E) CH SiO (C H (CH )SiO, (C H SiO and the methyl, phenyl and 3,3,3-trifluoropropyl radicals.

[(HOCH CH(CH SiO. 12. A copolymer as defined by claim 8 wherein the That which is Claimed siloxane (1) has the general formula 1. A siloxane having the general formula [(HO CHz)aC CHgO (CHz)a]bS iO -s-b [(HO)uR]bSIO4r-bll wherein each R is independently selected from the group 13. A copolymer as defined by claim 12 wherein b is 1. consisting of trivalent and tetravalent hydrocarbon and 14. A copolymer as defined by claim 13 wherein R" hydrocarbon ether radicals and is bonded to the silicon of siloxane (2) is selected from the group consisting of atom through a silicon-carbon bond, R is a monovalent the methyl, phenyl and 3,3,3-trifiuoropropyl radicals. hydrocarbon radical free of aliphatic unsaturation, a is an 15. A siloxane having the formula integer from 0 to 3 inclusive, b is an integer from 1 to 2 inclusive, 0 is an integer from 2 to 3 inclusive and all 3H: 711: of the hydroxyl groups are p ry ry groups CH|CHnC(CH:0H):CH10(OHi)aSi -OSl(CHa): OSl-- 2. A siloxane as defined in claim 1 having the general (13Hs L .|w l

I fomlula (CH2)30CHgC(CHnOH)gCHgCHa e0 [CHlCHIC(CHIOH)2 HI 1) ]bSl 4-1bI2 wherein w is an integer. 3. A siloxane as defined in claim 2 wherein b is 1. 16. A siloxane having the formula (3111 $11: (H0 HQDCCHZO(CHQI f-{OSIKCHQ2 O?l(CHI)SOOH1C(CH2OH)| CH: y CH;

4. A siloxane as defined in claim 2 wherein b is 2. wherein y is an integer. 5. A siloxane as defined in claim 1 having the general 17. A siloxane having the formula formula 7 a 18. A siloxane having the formula (C H [CH CH C(CH OH) CH O(CH ]SiO 20. A copolymer consisting of the siloxane units s s) a) and (CH3) [CH CH C(CH OH) CH O(CH ]SiO 21. A copolymer consisting of the siloxane units and References Cited by the Examiner UNITED STATES PATENTS 2/1965 Haluska 260-465 3/1951 Dannenberg et a1. 260-91.1 5/1954 Frisch et a1. 260-4482 11/1955 MacKenzie et a1. 260-4482 2/ 1958 Speier et a1. 260-4482 9/1959 Fianu 260-465 8/1961 Sterman 260-465 3/1965 Bailey 260-4488 FOREIGN PATENTS 9/ 1960 Canada.

DONALD E. CZAJA, Primary Examiner.

LEON I. BERCOVITZ, WILLIAM H. SHORT, M. I.

MARQUIS, Assistant Examiners. 

1. A SILOXANE HAVING THE GENERAL FORMULA
 8. A COPOLYMER CONSISTING ESSENTIALLY OF AT LEAST ONE SILOXANE UNIT HAVING THE GENERAL FORMULA 